What is Physics all about?

Physics can be defined as... Wait a minute. "Defined"? Well, how else does one explain Physics if not in the language of the subject. But therein lies the main problem. Most people and indeed most students fail to understand the language of Physics. And yet what happens around us is nothing but Physics. That we are able to fly in gadgets called airplanes or just that we are walking on the earth, simple things like that can all be explained by Physics. Our daily activities, the mysteries like why the earth revolves around the sun and not split away and take off into the universe are all revealed by the laws of Physics itself.  

Lets take gravity for instance. Gravity is what gives us our weight. But what we call weight is not really our weight but our mass. Mass that tells us how much matter is there in us. So when we say, "I weigh 50 kg.", what we really mean is, "My mass is 50 kg.". In that case what is our weight?

You can say, "My weight is 50 kg.f.", where kg.f is a gravitational unit of weight. That means just take the value of our mass which we get on the weighing scale and change the unit to kg.f to get our weight. Or else multiply the value of 'g' (acceleration due to gravity) to the value of mass.

Weight = mass  x acceleration due to gravity

Then the mass 50 kg translates to;

W= mg
    = 50 X 9.8
    = 490 N

where N (newton) is the unit for quantities of 'force', 'weight' and 'load'.

'Newton' needs no introduction to. He is the one who famously told us why things, when left freely, fall down and not the other way round. That's where the terms "falling freely" or "free fall" in Physics books have come from.